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UID:0-216@aerospace.technion.ac.il

DTSTART;TZID=Asia/Jerusalem:20211124T133000

DTEND;TZID=Asia/Jerusalem:20211124T143000

DTSTAMP:20230403T122604Z

URL:https://aerospace.technion.ac.il/events/active-noise-cancellation-via-
 thermo-acoustic-transducers/

SUMMARY:Active Noise Cancellation via Thermo-Acoustic Transducers
DESCRIPTION:Lecturer:Boris Leizeronok\n Faculty:Department of Aerospace Eng
 ineering\n Institute:Technion – Israel Institute of Technology\n Locatio
 n:Classroom 165\, ground floor\, Library\, Aerospace Eng. & https://techni
 on.zoom.us/j/95067058771\n Zoom: \n Abstract: \n Details: \n Sound product
 ion via Joule heating has been observed since late 19th century. The term 
 “thermophone” was coined soon after to define an acoustic transmitter\
 , where an alternating electrical current produces surface heat-flux fluct
 uations and\, consequently\, pressure waves in the surrounding fluid. Such
  transducers offer several potential advantages over conventional mechanic
 al devices owing to their design simplicity\, lightweight structure and ac
 oustic purity. Moreover\, thermophones are a promising technological step 
 in the field of active noise cancellation. The ability to generate sound w
 ithout mechanical motion enables to place the emitter directly at the nois
 e source rather than at the remote point of observation\, resulting in a g
 lobal destructive interference. Recent theoretical papers predict that for
  the case of vibrating noise boundary (such as conventional loudspeaker)\,
  at the optimal cancellation point\, the ratio between the thermal and kin
 etic energies of the two co-planar sources depends on the heat capacity ra
 tio of the fluid medium that surrounds the acoustic system.\nAlthough elec
 tro-thermo-acoustic energy conversion process has been the centerpiece of 
 several studies\, there is no clear consensus as to the correct approach t
 o modelling thermophone sound production. This leads to a lack of understa
 nding which structural properties would result in an optimal thermo-acoust
 ic transducer. The present research addresses this gap by implementing sta
 te-of-the-art thermophone simulation framework\, coupled with extensive ex
 perimental campaign\, that provide an outlook on the performance impact as
 sociated with various thermophone geometrical and physical properties. In 
 following\, feasibility of active noise cancellation of a vibrating source
  is demonstrated in various gaseous media.\nZoom meeting
CATEGORIES:Seminars
LOCATION:Classroom 165\, ground floor\, Library\, Aerospace Eng. & https://
 technion.zoom.us/j/95067058771

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